A long-tailed slug (Ibycus rachelae)
Perhaps the rarest of the extensive invertebrate species group are slugs which, according to scientists, are infrequently encountered. At great altitudes on Borneo, several rare and highly endemic species appear to exist, including one new colourful green and yellow species, Ibycus rachelae, described from Sabah, Malaysia, in the Heart of Borneo. Discovered on leaves in primary montane forest at altitudes up to 1,900m on Gunung Kinabalu, the species has a particularly long tail, three times the length of its head, with a body length of 4cm.
According to scientists, the slug has the habit of wrapping the long tail around its body when resting. From the Ariophantidae family, this unusual species makes use of so-called ‘love darts’ in courtship. Made of calcium carbonate, the love dart is harpoon-like which pierces and injects a hormone into a mate, and may play a role in increasing the chances of reproduction

The barreleye fish, already known as a species but filmed in the deep for the first time by the Monterey Bay Aquarium Research Institute (MBARI). The green orbs are its eyes, directed upwards to detect its prey in silhouette through its transparent head

A dragonfish from Australia. For many animals in the deep sea it may be weeks to months between meals. If they find something to eat, they hang on to it. This is why so many deep-sea fishes have lots of big teeth. This fish has teeth on its tongue. They would be terrifying animals if they weren't the size of a banana

Microscopic marine life. Zooplankton: Rosacea tentacles stretch a metre away from the main body and contract when disturbed by potential food items. The beads are stinging cells that immobilise and kill the prey

New species discovered by British Antarctic Survey: Isopod crustacean. These animals (woodlice of the sea) resemble fossil trilobites and are among the hundreds of new species discovered in the deep sea

This image provided by NOAA shows a deep-sea chimaera. Chimaeras are most closely related to sharks, although their evolutionary lineage branched off from sharks nearly 400m years ago, and they have remained an isolated group ever since. According to scientists the lateral lines running across this chimaera are mechano-receptors that detect pressure waves (just like ears). The dotted-looking lines on the frontal portion of the face (near the mouth) are ampullae de lorenzini and they detect perturbations in electrical fields generated by living organisms. Scientists using cutting-edge technology to explore waters off Indonesia predicted that as many as 40 new plant and animal species may have been discovered during a three-week expedition

The Hawaiian bobtail squid, Euprymna scolopes, has a clever way of duping predators during its nightly activities. It uses a symbiotic luminescent bacteria, Vibrio fischeri, to light up its underside, so that upwards-looking predators don't see a dark, edible form silhouetted against a moonlit or starlit sky. Instead, hungry sharks or other fish see only sky - the squid is invisible